Furnace.



No. 642,694. Patented Feb. 6, I900.

' J. B. HOWARD.

FURNACE.

(Application filed July 3, 1899.) (No Model.) 3 Sheets -Sheet .l.

Will 1 l vitmeooeo WW W 1M4 Patented Feb. 6, I900. J. B. HOWARD.

FURNACE.

[Apphcation filed July 3, 1899.)

3 Sheets-Sheet 2 "No Modal.)

. a'wve'ntoz v .1 @51 i liozmykk KRIS wzrzns c0. PHOT Qvihnaooeo lNITED STATES PATENT OFFICE.

JAMES BARZILLAI HOWARD, OF COLUMBUS, OHIO;

FURNACE.

' SPECIFICATION amensea of Letters Patent 1%. 642,694, dated Fetrue'r'y 6, 1960.

Application filed July 3, 1899- Serial No. 722,625. (No model.)

To ctZZ whom it may concern.-

Be it known that I, JAMES BARZILLAI How- ARD, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Furnaces; and .I' do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention pertains more particularly to means for consuming the smoke and carbureted hydrogen or other combustible gases rising from coal or other fuel in furnaces.

In many communities, especially where factories are numerous, the ejection of large vol-.

11 mes of smoke into the atmosphere has proved such a nuisance that ordinances have been enacted or are in contemplation compelling the owners of furnaces to usesome means to consume the smoke. Many plans have been devised, but all have been more or less 0bjectionable, because of their expense or because of partial or entire failure to accomplish the purpose. I have discovered that the smoke and gases may be effectually consumed, provided a sufficient quantity of highly-heated air be thrown into and commingled with the smoke and gases while they are in close proximity to the fire and before they have passed any considerable distance from the fuel mass. In ordinary boiler-furnaces the fuel is spread over a considerable area, and the body of smoke and gases arising is of greater cross-section than that arising in an ordinary heating-stove, so that in carrying out my idea provision must be made for injecting highly-heated air not only at the sides of the body of rising smoke and gas, but also into the body itself.

My present invention therefore consists in an improved construction and arrangement of air-heating lines and chambers, as hereinafter set forth and claimed, so as to insure the introduction into and commingling -uniformly with every part of the body of the smoke and gases arising from the fuel a large volume of highly-heated air or so that the supply of air may be independently regulated for a particular part of the furnace.

In the accompanying drawings, illustrating an embodiment of my improvements, Figure 1 is a longitudinal vertical sectional view. Fig. 2 is a top plan view with boiler omitted. Fig. 3 is a transverse vertical sectional view showing air-heating chambers and inlet lines or ducts therefor, the air heating or distributing arches being partially seen in elevation. Fig. 4 is a detail sectional view showing a fraction of an arch and a fl-ue or duct therefor. 1 Fig. 5 is a perspective view illustrating the exterior of a furnace. equipped with my improvements. Fig. 6 isa detail perspective of an air-heating chamber and its duet alone, and Fig. 7 is a similar view of a fraction of an arch and its duct or air-inlet.

Like characters of reference on the several Views designate corresponding parts.

1 designates the walls of the furnace, and 2 the grate. Builtin the side walls are a suitable number of air-ducts 3 and 3 of substantially right-angle or elbow form. One end of each of these ductsis shown to project beyond the outer wall of the furnace, where it is provided with a cover or door 3", preferably hinged to the duct at an incline, so that it may be lifted and opened by a vertical pull. The upper ends of the air-ducts are connected and communicate with chambers 4, while the upper ends of the ducts 3 are connected with tubular arches 4t, spanning the fire-chamber from wall to wall, as seen in Figs. 3 and 7. The chambers 4 are made bulging at their inner sides, so as to extend out into the firechamber over the fuel, and the under sides of these bulging chambers are provided with openings directed downward toward the surface of the fuel. The tubular arches are also made with openings graduated in size from relatively small at the ends to larger at the middle, so as to insure the discharge of a practically uniform quantity of air into the smoke and other products of combustion at all points. The elbows 3 and 3 are so placed in the walls of the furnace that their inner vertical sides shall form a portion of the surface inclosing the fuel-chamber, and therefore be in direct contact with the burning fuel, and when the air passes into said ducts it will be intensely heated by its contact with their sides. To further insure the intense heating of the air, these ducts are contracted toward their upper ends, so that the air is forced to pass in'contact with or close proxbers substantially like those at the sides, ex-- cept that they are longer. That at the front end is shown to extend entirely across the end of the furnace, while that at the rear or bridge wall end is in two sections, and their air-feeding ducts are arranged at the sides of the furnace, so that their doors or covers may conveniently be operated simultaneously with the others, as hereinafter set forth. The airheating sections at the bridge-wall are preferably each furnished with two air-ducts, because of the greater quantity'of heated air required at that place.

The ducts 3 and 3 and their chambers 4 and 4, respectively, are independent of each other and are conveniently arranged alternately, as indicated in the drawings. The air-heating chambers at eachend of the furnace and their air-feeding ducts are also independent of each other.

In starting the fire it will be expedient to have the air-ducts 3 and 3 closed and the door of the ash-pit opened, and after the fire has developed the door of the ashpit will be closed and the air-ducts opened.

In order 1 that all the doors or covers of the air-ducts,

to this bar 6 and passed over pulleys 7 and 8 to a weight-bar 9, hung across the front of the furnace within convenient reach of the firemen. When the fireman desires to open the covers or doors of the air-duets, he sim-' ply pulls down the bar 9 and hooks or otherwise secures it, so as to hold the doors or covers in their open position. If it should be desired to supply the air through only one or more chambers or tubes, this may be done by simply opening the door for that chamber or tube.

What I claim, and desire to secure by Letters Patent, is

1. In a smoke-consuming furnace, a series of independent air-heating ducts 3 and 3 arranged alternately side by side on each side of the fire-chamber and forming a part of the inner vertical wall thereof at the fire-chamber, movable covers for the inlet ends of said ducts, the ducts having air-heating chambers 4 that bulge or project inwardly over the fire-bed and have air out-lets or openings at their under sides only, and tubular arches 4 spanning the fire bed and connecting the ducts 3 and having air-openings at their under sides only, substantially as shown and described.

2. In a smoke-consuming furnace, a series of independent air-heating ducts 3 and 3 arranged alternately side by side and forming a part of the inner vertical walls thereof at the fire-chamber, movable covers for the in let ends of said ducts, the ducts 3 having airheating chambers that bulge or project inwardly over the fire-bed and have air outlets or openings at their under sides only, and tubular arches spanning the fire-bed and connecting the ducts 3 and having air-openings at their under sides only increasing in size from the ends of the arches to the middle thereof, substantially as shown and described.

3. In a smoke-consuming furnace, a series of independent air-heating ducts 3 and 3 arranged alternately side by side on each side of the fire-chamber and forming a part of the inner vertical walls thereof at the fire-chainber, movable covers for the inlet ends of said ducts 3, the ducts 3 having air-heating chambers that bulge or project inwardly over the fire-bed and have outlets or openings at their under sides only, andtubular arches 4 spanning thefire-bed and connecting the ducts 3 and having air-openings at theirunder sides only, and air-heating chambers substantially like the chambers 4 across the bridge-wall of the furnace having air-ducts also with movable covers at their inlet ends, substantially as shownand described.

4. In a smoke-consuming furnace aseries of independent air-heating ducts 3 and 3 having contracted openings at their outlet ends arranged alternatelyside byside on each side of the fire-chamber and forming apart of the inner vertical walls thereof at the fireehamber, movable covers for the inlet ends of said ducts, the ducts 3 having air-heating chambers 4 that bulge or project inwardly over the fire-bed and have airoutlets or openings at their under sides only,and tubular arches 4 spanning the fire-bed and connecting the ducts 3 and having air-openings at their under sides only, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES BARZILLAI HOWARD.

Witnesses:

GEORGE M. FINCKEL, J. Tune. WEYAN'r. 

